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Tornado rips through Joplin, Mo.

A massive tornado ripped through Joplin, Mo., Sunday, May 22, 2011. The Red Cross estimated as much as 75 percent of the town was leveled.

Mark Schiedelbein/AP Photo

Destroyed vehicles are piled on top of one another in the parking lot of the Joplin Regional Medical Center in Joplin, Mo., Sunday, May 22, 2011. A large tornado moved through much of the city, damaging the hospital and hundreds of homes and businesses.